ROME — The Obama administration is providing $100 million in new aid to Syria, U.S. officials said Wednesday, but the money is for humanitarian purposes only and not linked to any decision on arming Syrian rebels.

The announcement will be made by Secretary of State John Kerry on Thursday in Rome, where his diplomacy includes a meeting with Jordan’s foreign minister, the officials said.

The funds will help support 1.4 million Syrian refugees, including many in U.S. ally Jordan, and hundreds of thousands of other civilians trapped by the violence inside Syria’s border. Total U.S. humanitarian assistance in the two-year war will climb to $510 million.

The U.S. officials weren’t authorized to speak publicly on the matter ahead of Kerry’s announcement and demanded anonymity.

While the cash influx will certainly be welcomed by aid groups and refugee organizations that have lamented a lack of financial support, it is unlikely to end the clamoring for lethal assistance among the rebels fighting Syrian President Bashar Assad’s regime.

DENVER — Colorado energy regulators on Monday proposed tighter rules for shutting down oil and gas pipelines after a fatal explosion blamed on natural gas leaking from a line that was thought to be out of service but was still connected to a well. The Colorado Oil and Gas Conservation Commission rules govern flow lines, which carry oil, gas and...